20 N. S. ENTOMOLOGICAL SOCIETY 



Total Emergence from Pupae of all varieties 20 . 13% 



The following notes summarize data obtained from the 

 foregoing table: 



Emergence first 10 days after commencing. 



Yellow Transparent 89% 



Natural (Hard apple) 44% 



Bough Sweet 35% 



Astrakhan 42% 



Gravenstein 40 % 



The period of emergence was greatest in the case of the 

 Gravensteins and least prolonged for the Yellow Transparent. 



Percentage of Males and Females of Different Varieties. 



Males Females 



Gravenstein 39 61 



Astrakhan 50 50 



Bough Sweet 44 56 



Natural (Hard Apple) 54 46 



Transparent 43 57 



On consulting the chart of emergence, it will be seen that 

 the proportion of males tends to increase towards the latter 

 part of the period of emergence. 



Preoviposition Period. 



To determine the duration of this period under conditions 

 of control three cages were erected over as many trees, all the 

 fruit was enclosed in cheese cloth bags, a number of flies repre- 

 senting a single day's emergence were liberated in the cages 

 and a certain number of apples were exposed for a twenty-four 

 hour period each day thereafter. 



The following notes show the result of these experiments: 

 Oviposit ion in Fruit in Cages. 



Cage No. 1: — 27 females and 20 males liberated 23rd July. 

 July 26th, 1 puncture, egg 



